@subheading commands are, respectively, the unnumbered,
appendix-like, and heading-like equivalents of the
command. (See @subsection.)
@appendixsubsec do not need to
be used in ordinary circumstances, because
also be used within sections of
@appendix chapters (see @section).
@subheading command produces a heading like that of a
subsection except that it is not numbered and does not appear in the
table of contents. Similarly, an
produces an unnumbered heading like that of a subsection and an
@appendixsubsec command produces a subsection-like heading
labeled with a letter and numbers; both of these commands produce
headings that appear in the table of contents. In Info and plain
@subsection-like commands generate a title
underlined with hyphens.